I hate them...I find it difficult to gauge how much you are syringing in at a time and I worry that the piggy can asperate if you give too much. With a 1 ml syringe, you can syringe in the whole amount and then as the piggy is swallowing it down, you refill. I guess it's what we get used to. I have some great 1 ml syringes, that last for ages and just make it all so easy.
If Dot is eating quite a lot for herself, then I would be inclined to just top her up morning and night, whilst keeping a close eye on her weight. If weight starts to drop, then up the syringe feed slightly.